Using 3D road texture measurements for tyre/road noise modell

When investigating the generation of rolling noise, profound knowledge of the tyre/road interaction is inevitable. Research projects addressing the road surface influence on the noise generation are commonly based on standardized road surface texture parameters, e.g. mean profile depth or spectral analysis of surface profiles. Such quantities are calculated from line texture measurements or equally sized parts of 3D-road surface samples. AIT has recently developed a high-speed continuous 3D texture scanner which provides heightened spatial information down to 60µm. This allows the determination of a multitude of additional parameters of road surface geometries. In this paper, comparisons of line texture, statistical analyses of the variability of 3D texture parameters on real road sections, as well as basic statistical models to investigate correlations between these parameters and coupled Close-Proximity Method (CPX) measurements will be described.